Extracting local variables and refactoring leads to naming conflicts

[provide a description of the issue]

Environment

Operating System: Windows11
JDK version: 17
Visual Studio Code version: 1.88
Java extension version: 1.29

Steps To Reproduce

1. select "20"
2. click “Refacator-Extract local variable”
3. new variable name " existingVariable"

public class OriginalClass {
public void method() {
int existingVariable = 10;
// extract variable "20" , name :"existingVariable"
System.out.println(20);
}
}

refactoring result:

Reason: When extracting local variables, there was no detection of naming conflicts between the new variable name and the context

Expected behavior: Check for naming conflicts before and after refactoring, and provide warning prompts

使用列出的 Java 和扩展版本，通过提供的 OriginalClass 示例和 existingVariable 名称，在 VS Code 中复现报告的“Extract local variable”重构。跟踪重构入口，以确定冲突检查的位置。完成标准是：在重构前或重构后检测到冲突并显示警告，而不是悄无声息地产生冲突结果。